In some countries, a family home may have two or more bathrooms, each equipped with a toilet and a shower. People accustomed to such homes may wonder whether it is inconvenient for an entire Japanese family to share a single room containing the bathtub and washing area.
In a Japanese-style bath, people wash their bodies and hair in the washing area beside the tub. They rinse off all the soap before entering the water. The bathwater is therefore used mainly for soaking and warming the body rather than for washing, allowing several family members to use the same water one after another.
During the evening, family members take turns bathing. A well-insulated tub and a reheating function can keep the water warm even when they bathe at slightly different times.
The order is not necessarily fixed. Family members may simply ask, “Are you going first?” or “Can I go later?” and adjust according to the day’s schedule. Someone who enjoys a long bath may keep the next person waiting, but there is a general expectation that everyone will use the bath in turn.
Another important difference is that toilets and washbasins are often located outside the bath area in Japanese homes. Even while someone is bathing, other family members can still use the toilet or brush their teeth. This separation makes it easier for a family to manage with only one place for bathing.
Building a second one also requires much more than simply adding another tub. It needs water-resistant floors and walls, plumbing and drainage, ventilation, and a system for supplying hot water. It also takes up a considerable amount of space. Adding another bath area means losing space that could otherwise be used for a bedroom, living area, or storage.
When family members can use one bath in turn, there is often little reason to give up extra space and pay for another complete set of facilities. A second one would also create more areas to clean, maintain, and repair.
There are exceptions. Large houses and homes built for two generations of a family may have two bath areas or an additional shower room. A separate bathing space may also be useful when family members keep very different schedules or when it is needed for caregiving.
For many households, however, one bath area is enough. Family members use it in turn while the toilet and washbasin remain available elsewhere. The home is arranged so that sharing one bath does not disrupt the rest of family life.